CN113381057A - High-safety lithium ion battery and preparation method thereof - Google Patents
High-safety lithium ion battery and preparation method thereof Download PDFInfo
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- CN113381057A CN113381057A CN202110635096.9A CN202110635096A CN113381057A CN 113381057 A CN113381057 A CN 113381057A CN 202110635096 A CN202110635096 A CN 202110635096A CN 113381057 A CN113381057 A CN 113381057A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 48
- 239000002002 slurry Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 32
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 18
- 239000003792 electrolyte Substances 0.000 claims abstract description 10
- 238000005261 decarburization Methods 0.000 claims abstract description 3
- 238000005520 cutting process Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 24
- 239000011267 electrode slurry Substances 0.000 claims description 18
- 239000002904 solvent Substances 0.000 claims description 18
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000002033 PVDF binder Substances 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 239000006258 conductive agent Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000003756 stirring Methods 0.000 description 28
- 239000007787 solid Substances 0.000 description 14
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 239000011888 foil Substances 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 239000011889 copper foil Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000006256 anode slurry Substances 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 5
- 238000011076 safety test Methods 0.000 description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001467 acupuncture Methods 0.000 description 3
- 238000005524 ceramic coating Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000006257 cathode slurry Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/664—Ceramic materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a high-safety lithium ion battery and a preparation method thereof, wherein the high-safety lithium ion battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive current collector, a conductive carbon layer arranged on the surface of the positive current collector, a positive slurry layer arranged on the surface of a conductive decarburization layer and a ceramic material layer arranged on the surface of the positive slurry layer; the negative plate comprises a negative current collector, a conductive carbon layer arranged on the surface of the negative current collector and a negative slurry layer arranged on the surface of the conductive decarburized layer, and the safety performance of the battery, particularly the needling effect, is improved by increasing or reducing the coating structure on the current collector.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a high-safety lithium ion battery and a preparation method thereof.
Background
The lithium ion battery has the advantages of high energy density, high working voltage, high safety performance, long service life and the like as a green environment-friendly battery, and is very easy to generate short circuit and generate electric sparks to ignite electrolyte to explode in safety tests such as overcharge, hot box and needling processes, so that great potential safety hazards exist, wherein needling is the greatest safety challenge of a battery core.
Disclosure of Invention
In order to realize high safety of the lithium ion battery, the invention provides the high-safety lithium ion battery and the preparation method thereof, which can obviously improve the safety performance of a battery cell, particularly the needling effect.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-safety lithium ion battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive plate comprises a positive current collector, a conductive carbon layer arranged on the surface of the positive current collector, a positive slurry layer arranged on the surface of a conductive decarburization layer and a ceramic material layer arranged on the surface of the positive slurry layer; the negative plate comprises a negative current collector, a conductive carbon layer arranged on the surface of the negative current collector, and a negative slurry layer arranged on the surface of the conductive decarburized layer.
The ceramic material layer is arranged on the surface of the positive slurry layer intermittently, and the intermittent length is the length of each battery cell positive pole piece minus the circumference of the outermost layer.
The negative slurry layer is arranged on the surface of the conductive decarburized layer intermittently, and the intermittent length is the perimeter of the outermost layer of the battery core or the perimeter of the outermost layer of the battery core is-2-5 mm.
The raw materials of the ceramic material layer comprise a ceramic material, a binder and a solvent; the thickness of the ceramic material layer is 1-2 mu m, and the excessively thick ceramic material layer can occupy the thickness space of the battery cell and reduce the capacity of the battery cell.
The ceramic material is alumina; the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone.
The weight ratio of the ceramic material to the binder is 1: 1 the insulation and bonding effects after the ceramic material is coated are optimal under the mixture ratio.
The raw materials of the conductive carbon layer comprise a carbon conductive agent, a binder and a solvent; the thickness of the conductive carbon layer is 1-2 mu m. The excessively thick ceramic layer can occupy the thickness space of the battery cell and reduce the capacity of the battery cell.
The carbon conductive agent is conductive carbon black; the binder is polyvinylidene fluoride; the solvent is N-methyl pyrrolidone.
The weight ratio of the carbon conductive agent to the binder is 4: 6. The conductivity and the bonding effect of the material are optimal under the mixture ratio.
The positive current collector is an aluminum foil; the negative current collector is a copper foil.
The preparation method of the high-safety lithium ion battery provided by the invention comprises the following steps:
(1) coating conductive carbon layer slurry on the surface of the positive current collector, baking, rolling and cutting into pieces to prepare the carbon layer positive current collector;
(2) coating positive electrode slurry on the surface of the carbon layer positive electrode current collector, baking, rolling and cutting into pieces to prepare a positive electrode piece;
(3) intermittently spraying ceramic slurry on the surface of the positive pole piece, baking, rolling and cutting into pieces to prepare the positive pole piece to be assembled;
(4) coating conductive carbon layer slurry on the surface of the negative current collector, baking, rolling and cutting into pieces to prepare a carbon layer negative current collector;
(5) intermittently coating negative electrode slurry on the surface of the carbon layer negative electrode current collector, baking, rolling and cutting into pieces to prepare a negative electrode piece;
(6) and (3) winding the positive pole piece, the negative pole piece, the PE isolating membrane and the electrolyte to be assembled, assembling, baking, welding, sealing, injecting liquid, forming and the like to prepare the battery core.
In the step (1) and the step (4), the baking temperature is 60 +/-5 ℃.
In the step (2), the baking temperature is 100 +/-5 ℃.
In the step (3), the length value of the ceramic material spraying is equal to the circumference of the outermost layer of the battery cell, and the spraying interval length is obtained by subtracting the circumference of the outermost layer from the length of each positive electrode piece of the battery cell. The coating is schematically shown in FIG. 5.
In the step (3), the baking temperature is 80 +/-5 ℃.
In the step (5), the length value of the coating of the negative electrode slurry is obtained by subtracting the perimeter of the outermost layer from the length of each cell negative electrode piece or subtracting the perimeter of the outermost layer and then adding 2-5 mm; the intermittent length of the coating is-2-5 mm of the circumference of the outermost layer of the battery cell or the circumference of the outermost layer of the battery cell.
In the step (5) and the step (6), the baking temperature is 90 +/-5 ℃.
The ceramic layer is added on the outermost layer of the positive electrode so as to reduce the contact chance between the aluminum foil and the negative electrode membrane when foreign matters penetrate through the outermost layer. The intermittent coating of the cathode diaphragm on the outermost layer of the cathode has three purposes: firstly, when foreign matters puncture the outermost layer, the battery cell can firstly contact with a negative current collector through metal in the shell or the outer package for discharging, so that the charge capacity of the battery cell is reduced, and the safety is improved; secondly, the thickness influence caused by ceramic coating on the surface of the positive pole piece is reduced; and thirdly, the dosage of the positive diaphragm slurry of each battery cell can be reduced, so that the effect of reducing the cost is achieved. A thin carbon layer is coated between the positive current collector and the positive slurry, so that when the temperature rises to a certain degree before the battery core fails, the adhesive is decomposed and loses the connection effect, namely, the current collector and the diaphragm form a short circuit; a thin carbon layer is coated between the negative current collector and the negative slurry, the purpose of the thin carbon layer is similar to that of the positive electrode and the intermediate carbon layer, and the intermediate coating process and the formula are consistent, so that the production process can be simplified.
According to the high-safety lithium ion battery provided by the invention, ceramic coating is added on the outermost layer of the anode, the cathode diaphragm is coated on the outermost layer of the cathode intermittently, carbon layer coating is added between the anode diaphragm, the cathode diaphragm and the current collector, and the safety performance of the battery, especially the needling effect, is improved by adding or reducing the coating structure on the current collector.
Drawings
Fig. 1 is the results of a needle punch test of the pouch cell of example 1;
fig. 2 is the results of a needle punch test of the pouch cell of example 2;
fig. 3 is a result of a needle punching experiment of the pouch battery in comparative example 1;
fig. 4 is a result of a needle punching experiment of the pouch battery in comparative example 2;
fig. 5 is a schematic diagram of a ceramic coating process of the positive electrode plate.
Fig. 6 is a schematic diagram of a process of coating a negative diaphragm on a negative electrode plate.
Detailed Description
Example 1[ lithium cobaltate + graphite + safety Structure ]
And (3) preparing a 3Ah soft package battery by using a Lithium Cobaltate (LCO) positive pole piece with the mass ratio of 95% and a graphite negative pole piece with the mass ratio of 95%, and finally performing a needling safety test.
Wherein the 3Ah soft package manufacturing process comprises the following steps:
1. adding 40% of conductive carbon black and 60% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent to control the solid content of the slurry to be between 30% and 50%, and then stirring at high speed to prepare carbon layer slurry;
2. coating the carbon layer slurry in the step 1 on an aluminum foil, and then baking, rolling and cutting the aluminum foil at the temperature of 60 +/-5 ℃ to prepare a carbon layer aluminum foil;
3. adding 95% of LCO, 1% of conductive carbon black and 4% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent to control the solid content of the slurry to be 65-75%, and then stirring at high speed to prepare anode slurry;
4. coating the anode slurry in the step 3 on the carbon layer aluminum foil in the step 2, and then baking, rolling and cutting into pieces at 100 +/-5 ℃ to prepare an anode piece;
5. adding 50% of alumina and 50% of polyvinylidene fluoride in a mass ratio into a stirring tank, adding an N-methyl pyrrolidone solvent to control the solid content of the slurry to be between 25% and 40%, and then stirring at a high speed to prepare ceramic slurry;
6. and (3) intermittently spraying the ceramic slurry in the step (5) on the positive pole piece, wherein the spraying length value is equal to the outermost perimeter of the battery cell, the spraying intermittent length is obtained by subtracting the outermost perimeter from the length of each positive pole piece of the battery cell, and then baking, rolling and cutting the pieces at the temperature of 80 +/-5 ℃ to prepare the positive pole piece to be assembled.
7. Adding 40% of conductive carbon black and 60% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent to control the solid content of the slurry to be between 30% and 50%, and then stirring at high speed to prepare carbon layer slurry;
8. coating the carbon layer slurry in the step 7 on a copper foil, and then baking, rolling and cutting into pieces at 60 +/-5 ℃ to prepare a carbon layer copper foil;
9. adding 95% of graphite, 1% of conductive carbon black, 2% of styrene butadiene rubber and 2% of sodium carboxymethylcellulose into a stirring tank by mass ratio, adding deionized water to control the solid content of the slurry to be 48-55%, and then stirring at high speed to prepare negative electrode slurry;
10. intermittently coating the negative electrode slurry in the step 9 on the copper foil of the carbon layer in the step 8, and then baking, rolling and cutting into pieces at 90 +/-5 ℃ to prepare a negative electrode piece; the length value of the coating of the negative electrode slurry is obtained by subtracting the circumference of the outermost layer of the battery cell from the length of the negative electrode plate of each battery cell and then adding 2-5 mm; the intermittent length of the coating is the circumference of the outermost layer of the battery cell, and then is reduced by 2-5 mm.
11. And (3) winding and assembling the positive pole piece, the negative pole piece, the PE isolating membrane and the electrolyte to be assembled, baking at 90 +/-5 ℃, welding and sealing, injecting liquid, forming and the like to prepare the soft package battery core.
After the battery cell is fully charged, the acupuncture test is carried out according to the GBT 31485 and the other 2015 standard, and the battery cell hardly changes after the test, does not catch fire or explode and passes the national standard safety standard.
Example 2[ NCM811+ silicon carbon + Security Structure ]
The NCM811 positive pole piece with the mass ratio of 85% and the silicon-carbon negative pole piece with the mass ratio of 90% are used for manufacturing a 26Ah hard shell battery, the humidity is controlled within 2% in the whole manufacturing process, and finally, a needling safety test is carried out.
The 26Ah hard shell manufacturing process comprises the following steps:
1. adding 40% of conductive carbon black and 60% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent, controlling the solid content of the slurry to be 30% -50%, and then stirring at a high speed to prepare carbon layer slurry;
2. and (3) coating the anode slurry in the step (1) on an aluminum foil, and then baking, rolling and cutting the aluminum foil at the temperature of 60 +/-5 ℃ to prepare the carbon layer aluminum foil.
3. Adding NCM811 with the mass ratio of 85%, conductive carbon black 9% and polyvinylidene fluoride 6% into a stirring tank, adding N-methyl pyrrolidone solvent, controlling the solid content of the slurry to be 70% -78%, and then stirring at high speed to prepare anode slurry;
4. and (3) coating the positive electrode slurry in the step (3) on the carbon-coated aluminum foil in the step (2), and then baking, rolling and cutting pieces at 100 +/-5 ℃ to prepare a positive electrode piece.
5. Adding 50% of alumina and 50% of polyvinylidene fluoride in a mass ratio into a stirring tank, adding an N-methyl pyrrolidone solvent, controlling the solid content of the slurry to be 25-40%, and then stirring at a high speed to prepare ceramic slurry;
6. and (3) intermittently spraying the ceramic slurry in the step (5) on the positive pole piece, wherein the spraying length value is equal to the outermost perimeter of the battery cell, the spraying intermittent length is obtained by subtracting the outermost perimeter from the length of each positive pole piece of the battery cell, and then baking, rolling and cutting the pieces at the temperature of 80 +/-5 ℃ to prepare the positive pole piece to be assembled.
7. Adding 40% of conductive carbon black and 60% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent, controlling the solid content of the slurry to be 30% -50%, and then stirring at a high speed to prepare carbon layer slurry;
8. and (3) coating the carbon layer slurry in the step (7) on a copper foil, and then baking, rolling and cutting the copper foil at the temperature of 60 +/-5 ℃ to obtain the carbon layer copper foil.
9. Adding 90% of silicon carbon, 4% of conductive carbon black, 3% of styrene butadiene rubber and 3% of sodium carboxymethylcellulose in mass ratio into a stirring tank, adding deionized water, controlling the solid content to be 50-55%, and then stirring at high speed to prepare cathode slurry;
10. and (3) coating the negative electrode slurry in the step (3) on the carbon-coated copper foil in the step (8), and then baking, rolling and cutting into pieces at the temperature of 95 +/-5 ℃ to prepare a negative electrode piece. The length value of the coating of the negative electrode slurry is obtained by subtracting the circumference of the outermost layer of the battery cell from the length of the negative electrode plate of each battery cell and then adding 2-5 mm; the intermittent length of the coating is the circumference of the outermost layer of the battery cell, and then is reduced by 2-5 mm.
11. The positive and negative pole pieces, the PE isolating membrane and the electrolyte are made into the hard shell battery cell through the procedures of winding, assembling, baking at 100 +/-5 ℃, welding, sealing, injecting liquid, forming and the like.
12. After the battery cell is fully charged, the acupuncture test is carried out according to the GBT 31485 and the other 2015 standard, and the battery cell hardly changes after the test, does not catch fire or explode and passes the national standard safety standard.
Comparative example 1[ LCO + graphite ]
And (3) preparing the 3Ah soft package battery by using an LCO positive pole piece with the mass ratio of 90% and a graphite negative pole piece with the mass ratio of 90%, and finally performing a needling safety test.
Wherein the 3Ah soft package manufacturing process comprises the following steps:
1. adding 90% of LCO, 5% of conductive carbon black and 5% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent, controlling the solid content of the slurry to be 65-75%, and then stirring at high speed to prepare anode slurry;
2. and (3) coating the positive electrode slurry in the step (1) on an aluminum foil, and then baking, rolling and cutting pieces at 90 +/-5 ℃ to obtain the positive electrode piece.
3. Adding 90% of graphite, 5% of conductive carbon black, 3% of styrene butadiene rubber and 2% of sodium carboxymethylcellulose into a stirring tank by mass ratio, adding deionized water, controlling the solid content of the slurry to be 48-55%, and then stirring at high speed to prepare negative electrode slurry;
4. and (3) coating the negative electrode slurry in the step (3) on copper foil, and then baking, rolling and cutting into pieces at 90 +/-5 ℃ to obtain the negative electrode piece.
5. Winding, assembling, baking at 90 +/-5 ℃, welding, sealing, injecting liquid, forming and the like the positive and negative pole pieces, the PE isolating film and the electrolyte to prepare the soft package battery core.
6. After the battery cell is fully charged, performing a needling test according to the GBT 31485-;
comparative example 2[ NCM811+ silicon carbon ]
The NCM811 positive pole piece with the mass ratio of 80% and the silicon-carbon negative pole piece with the mass ratio of 85% are used for manufacturing a 26Ah hard shell battery, the humidity is controlled within 2% in the whole manufacturing process, and finally, a needling safety test is carried out.
The 26Ah hard shell manufacturing process comprises the following steps:
1. adding 80% of NCM811, 12% of conductive carbon black and 8% of polyvinylidene fluoride in a stirring tank, adding N-methyl pyrrolidone solvent, controlling the solid content of the slurry to be 70% -78%, and then stirring at high speed to prepare anode slurry;
2. and (3) coating the positive electrode slurry in the step (1) on an aluminum foil, and then baking, rolling and cutting pieces at 100 +/-5 ℃ to prepare the positive electrode piece.
3. Adding 85 mass percent of silicon carbon, 7 mass percent of conductive carbon black, 5 mass percent of styrene butadiene rubber and 3 mass percent of sodium carboxymethylcellulose into a stirring tank, adding deionized water, controlling the solid content to be 50-55%, and then stirring at high speed to prepare cathode slurry;
4. and (3) coating the negative electrode slurry in the step (3) on copper foil, and then baking, rolling and cutting into pieces at 95 +/-5 ℃ to obtain the negative electrode piece.
5. The positive and negative pole pieces, the PE isolating membrane and the electrolyte are made into the hard shell battery cell through the procedures of winding, assembling, baking at 100 +/-5 ℃, welding, sealing, injecting liquid, forming and the like.
6. And after the battery cell is fully charged, performing acupuncture test according to the GBT 31485 and 2015 standard, wherein the battery cell after the test is on fire and explodes and does not pass the national standard safety standard.
The above detailed description of a high safety lithium ion battery and a method for manufacturing the same with reference to the embodiments is illustrative and not restrictive, and several embodiments may be enumerated within the scope of the limitations, so that variations and modifications thereof without departing from the general inventive concept should fall within the scope of the present invention.
Claims (10)
1. A high-safety lithium ion battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, and is characterized in that the positive plate comprises a positive current collector, a conductive carbon layer arranged on the surface of the positive current collector, a positive slurry layer arranged on the surface of the conductive decarburization layer, and a ceramic material layer arranged on the surface of the positive slurry layer; the negative plate comprises a negative current collector, a conductive carbon layer arranged on the surface of the negative current collector, and a negative slurry layer arranged on the surface of the conductive decarburized layer.
2. The high-safety lithium ion battery according to claim 1, wherein the ceramic material layer is intermittently arranged on the surface of the positive electrode slurry layer, and the intermittent length is the length of each cell positive electrode plate minus the circumference of the outermost layer.
3. The high-safety lithium ion battery according to claim 1 or 2, wherein the negative electrode slurry layer is intermittently arranged on the surface of the conductive decarburized layer, and the intermittent length is-2-5 mm of the circumference of the outermost layer of the battery cell or the circumference of the outermost layer of the battery cell.
4. The high-safety lithium ion battery according to claim 1 or 2, wherein the thickness of the ceramic material layer is 1-2 μm; the thickness of the conductive carbon layer is 1-2 mu m.
5. The high-safety lithium ion battery according to claim 1 or 2, wherein the raw materials of the ceramic material layer comprise a ceramic material, a binder and a solvent.
6. The high safety lithium ion battery of claim 5, wherein the ceramic material is alumina; the binder is polyvinylidene fluoride, and the solvent is N-methyl pyrrolidone.
7. The high-safety lithium ion battery according to claim 1 or 2, wherein the raw material of the conductive carbon layer comprises a carbon conductive agent, a binder and a solvent.
8. The high-safety lithium ion battery according to claim 7, wherein the carbon conductive agent is conductive carbon black; the binder is polyvinylidene fluoride; the solvent is N-methyl pyrrolidone.
9. The method for preparing a high-safety lithium ion battery according to any one of claims 1 to 8, wherein the preparation method comprises the following steps:
(1) coating conductive carbon layer slurry on the surface of the positive current collector, baking, rolling and cutting into pieces to prepare the carbon layer positive current collector;
(2) coating positive electrode slurry on the surface of the carbon layer positive electrode current collector, baking, rolling and cutting into pieces to prepare a positive electrode piece;
(3) intermittently spraying ceramic slurry on the surface of the positive pole piece, baking, rolling and cutting into pieces to prepare the positive pole piece to be assembled;
(4) coating conductive carbon layer slurry on the surface of the negative current collector, baking, rolling and cutting into pieces to prepare a carbon layer negative current collector;
(5) intermittently coating negative electrode slurry on the surface of the carbon layer negative electrode current collector, baking, rolling and cutting into pieces to prepare a negative electrode piece;
(6) and (3) winding the positive pole piece, the negative pole piece, the PE isolating membrane and the electrolyte to be assembled, assembling, baking, welding, sealing, injecting liquid, forming and the like to prepare the battery core.
10. The preparation method according to claim 9, wherein in the step (3), the ceramic material is sprayed by a length equal to the circumference of the outermost layer of the cell, and the spraying pause length is the length of each positive electrode piece of the cell minus the circumference of the outermost layer.
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| CN114695841A (en) * | 2022-04-25 | 2022-07-01 | 芜湖天弋能源科技有限公司 | Lithium ion battery positive pole piece, lithium ion battery and preparation method thereof |
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| TWI689465B (en) * | 2019-03-13 | 2020-04-01 | 國立清華大學 | Method for manufacturing carbon conductive coating |
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